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diff --git a/src/qml/jsapi/qjsmanagedvalue.h b/src/qml/jsapi/qjsmanagedvalue.h
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+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QJSMANAGEDVALUE_H
+#define QJSMANAGEDVALUE_H
+
+#include <QtQml/qtqmlglobal.h>
+#include <QtQml/qjsprimitivevalue.h>
+#include <QtQml/qjsvalue.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+struct Value;
+struct ExecutionEngine;
+}
+
+class QJSEngine;
+class Q_QML_EXPORT QJSManagedValue
+{
+    Q_DISABLE_COPY(QJSManagedValue)
+public:
+    enum Type {
+        Undefined,
+        Boolean,
+        Number,
+        String,
+        Object,
+        Symbol
+    };
+
+    QJSManagedValue() = default;
+    QJSManagedValue(QJSValue value, QJSEngine *engine);
+    QJSManagedValue(const QJSPrimitiveValue &value, QJSEngine *engine);
+    QJSManagedValue(const QVariant &variant, QJSEngine *engine);
+    QJSManagedValue(const QString &string, QJSEngine *engine);
+
+    ~QJSManagedValue();
+    QJSManagedValue(QJSManagedValue &&other);
+    QJSManagedValue &operator=(QJSManagedValue &&other);
+
+    bool equals(const QJSManagedValue &other) const;
+    bool strictlyEquals(const QJSManagedValue &other) const;
+
+    QJSEngine *engine() const;
+
+    QJSManagedValue prototype() const;
+    void setPrototype(const QJSManagedValue &prototype);
+
+    Type type() const;
+
+    // Compatibility with QJSValue
+    bool isUndefined() const { return type() == Undefined; }
+    bool isBoolean() const { return type() == Boolean; }
+    bool isNumber() const { return type() == Number; }
+    bool isString() const { return type() == String; }
+    bool isObject() const { return type() == Object; }
+    bool isSymbol() const { return type() == Symbol; }
+
+    // Special case of Number
+    bool isInteger() const;
+
+    // Selected special cases of Object
+    bool isNull() const;
+    bool isRegularExpression() const;
+    bool isArray() const;
+    bool isUrl() const;
+    bool isVariant() const;
+    bool isQObject() const;
+    bool isQMetaObject() const;
+    bool isDate() const;
+    bool isError() const;
+    bool isCallable() const;
+
+    // Native type transformations
+    QString toString() const;
+    double toNumber() const;
+    bool toBoolean() const;
+
+    // Variant-like type transformations
+    QJSPrimitiveValue toPrimitive() const;
+    QJSValue toJSValue() const;
+    QVariant toVariant() const;
+
+    // Special cases
+    int toInteger() const;
+    QRegularExpression toRegularExpression() const;
+    QUrl toUrl() const;
+    QObject *toQObject() const;
+    const QMetaObject *toQMetaObject() const;
+    QDateTime toDateTime() const;
+
+    // Properties of objects
+    bool hasProperty(const QString &name) const;
+    bool hasOwnProperty(const QString &name) const;
+    QJSValue property(const QString &name) const;
+    void setProperty(const QString &name, const QJSValue &value);
+    bool deleteProperty(const QString &name);
+
+    // Array indexing
+    bool hasProperty(quint32 arrayIndex) const;
+    bool hasOwnProperty(quint32 arrayIndex) const;
+    QJSValue property(quint32 arrayIndex) const;
+    void setProperty(quint32 arrayIndex, const QJSValue &value);
+    bool deleteProperty(quint32 arrayIndex);
+
+    // Calling functions
+    QJSValue call(const QJSValueList &arguments = {}) const;
+    QJSValue callWithInstance(const QJSValue &instance, const QJSValueList &arguments = {}) const;
+    QJSValue callAsConstructor(const QJSValueList &arguments = {}) const;
+
+private:
+    friend class QJSValue;
+    friend class QJSEngine;
+
+    QJSManagedValue(QV4::ExecutionEngine *engine);
+    QV4::Value *d = nullptr;
+};
+
+QT_END_NAMESPACE
+
+#endif